add react-java-mysql application sample

Signed-off-by: Anca Iordache <anca.iordache@docker.com>

samples/react-java-mysql/frontend/config/nginx.conf

@@ -0,0 +1,9 @@
+server {
+    listen       9000;
+    server_name  localhost;
+
+    location / {
+        root   /usr/share/nginx/html;
+        index  index.html index.htm;
+    }
+}